Fundamentals of Operating Systems Course
https://oscourse.win
Very clever! We often call read/rcv system call to read requests from a connection, this copies data from kernel receive buffer to user space which has a cost.
This new patch changes this to allow zero copy with notification.
“Reading' data out of a socket instead becomes a “notification” mechanism, where the kernel tells userspace where the data is.”
This kernel patch enables zero copy from the receive queue.
https://lore.kernel.org/io-uring/ZwW7_cRr_UpbEC-X@LQ3V64L9R2/T/
0:00 Intro
1:30 patch summary
7:00 Normal Connection Read (Kernel Copy)
12:40 Zero copy Read
15:30 Performance